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Cache access to the kernel's ARP table.

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This commit is contained in:
Simon Kelley
2015-12-23 16:15:58 +00:00
parent d3a8b39c7d
commit 11867dc28c
6 changed files with 223 additions and 77 deletions
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37
src/edns0.c
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@@ -213,42 +213,15 @@ size_t add_do_bit(struct dns_header *header, size_t plen, char *limit)
return add_pseudoheader(header, plen, (unsigned char *)limit, PACKETSZ, 0, NULL, 0, 1);
}
static int filter_mac(int family, char *addrp, char *mac, size_t maclen, void *parmv)
{
struct macparm *parm = parmv;
int match = 0;
if (family == parm->l3->sa.sa_family)
{
if (family == AF_INET && memcmp(&parm->l3->in.sin_addr, addrp, INADDRSZ) == 0)
match = 1;
#ifdef HAVE_IPV6
else
if (family == AF_INET6 && memcmp(&parm->l3->in6.sin6_addr, addrp, IN6ADDRSZ) == 0)
match = 1;
#endif
}
if (!match)
return 1; /* continue */
parm->plen = add_pseudoheader(parm->header, parm->plen, parm->limit, PACKETSZ, EDNS0_OPTION_MAC, (unsigned char *)mac, maclen, 0);
return 0; /* done */
}
size_t add_mac(struct dns_header *header, size_t plen, char *limit, union mysockaddr *l3)
{
struct macparm parm;
parm.header = header;
parm.limit = (unsigned char *)limit;
parm.plen = plen;
parm.l3 = l3;
int maclen;
unsigned char mac[DHCP_CHADDR_MAX];
iface_enumerate(AF_UNSPEC, &parm, filter_mac);
if ((maclen = find_mac(l3, mac, 1)) != 0)
plen = add_pseudoheader(header, plen, limit, PACKETSZ, EDNS0_OPTION_MAC, mac, maclen, 0);
return parm.plen;
return plen;
}
struct subnet_opt {